[gnome-music/wip/mschraal/albumsview-selection-rework: 1/8] albumwidget: Route selections via coreobjects

[Marinus Schraal <mschraal src gnome org>]

commit a593e014ea9426552e8abc5835d1c6059b1db61f
Author: Marinus Schraal <mschraal gnome org>
Date:   Fri Sep 10 23:45:09 2021 +0200

    albumwidget: Route selections via coreobjects
    
    Selection changes were triggered through the widgets. However,
    this is rather the long way around if you want to actually select
    the coreobjects. In GTK4 it is frowned upon cycling through widgets to
    obtain their properties, so it is no longer sustainable.
    
    Trigger selection changes directly through the coreobjects.

 gnomemusic/widgets/albumwidget.py       | 10 ++++++++--
 gnomemusic/widgets/disclistboxwidget.py | 15 +++++++--------
 2 files changed, 15 insertions(+), 10 deletions(-)
---
diff --git a/gnomemusic/widgets/albumwidget.py b/gnomemusic/widgets/albumwidget.py
index 20bcf2e7b..1c4255c59 100644
--- a/gnomemusic/widgets/albumwidget.py
+++ b/gnomemusic/widgets/albumwidget.py
@@ -193,6 +193,8 @@ class AlbumWidget(Handy.Clamp):
         disc_box = DiscBox(self._application, self._corealbum, disc)
         disc_box.connect('song-activated', self._song_activated)
 
+        self._corealbum.bind_property(
+            "selected", disc, "selected", GObject.BindingFlags.SYNC_CREATE)
         self._disc_list_box.bind_property(
             "selection-mode", disc_box, "selection-mode",
             GObject.BindingFlags.BIDIRECTIONAL
@@ -265,10 +267,14 @@ class AlbumWidget(Handy.Clamp):
         self._play(song_widget.props.coresong)
 
     def select_all(self) -> None:
-        self._disc_list_box.select_all()
+        if self._album_model:
+            for coredisc in self._album_model:
+                coredisc.props.selected = True
 
     def deselect_all(self) -> None:
-        self._disc_list_box.deselect_all()
+        if self._album_model:
+            for coredisc in self._album_model:
+                coredisc.props.selected = False
 
     def _on_selection_mode_changed(
             self, widget: Gtk.Widget, value: GObject.ParamSpecBoolean) -> None:
diff --git a/gnomemusic/widgets/disclistboxwidget.py b/gnomemusic/widgets/disclistboxwidget.py
index 251c2c1cd..495f0ce7c 100644
--- a/gnomemusic/widgets/disclistboxwidget.py
+++ b/gnomemusic/widgets/disclistboxwidget.py
@@ -69,6 +69,7 @@ class DiscBox(Gtk.ListBoxRow):
 
         self._application = application
         self._corealbum = corealbum
+        self._coredisc = coredisc
         self._model: Gio.ListModel = coredisc.props.model
 
         disc_nr: int = coredisc.props.disc_nr
@@ -82,23 +83,21 @@ class DiscBox(Gtk.ListBoxRow):
 
     def select_all(self):
         """Select all songs"""
-        def child_select_all(child):
-            child.props.coresong.props.selected = True
-
-        self._list_box.foreach(child_select_all)
+        for coresong in self._model:
+            coresong.props.selected = True
 
     def deselect_all(self):
         """Deselect all songs"""
-        def child_deselect_all(child):
-            child.props.coresong.props.selected = False
-
-        self._list_box.foreach(child_deselect_all)
+        for coresong in self._model:
+            coresong.props.selected = False
 
     def _create_widget(self, coresong):
         song_widget = SongWidget(coresong)
         song_widget.props.menu = SongWidgetMenu(
             self._application, song_widget, self._corealbum)
 
+        self._coredisc.bind_property(
+            "selected", coresong, "selected", GObject.BindingFlags.SYNC_CREATE)
         self.bind_property(
             "selection-mode", song_widget, "selection-mode",
             GObject.BindingFlags.BIDIRECTIONAL